From: Mika Westerberg <mika.westerberg@linux.intel.com>
Date: Sun, 13 Feb 2022 15:16:24 +0000 (+0200)
Subject: thunderbolt: Ignore port locked error in tb_port_wait_for_link_width()
X-Git-Tag: v6.1-rc5~1161^2~10^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0a2e1667a73fe0c4374ddace925d85a4072d509c;p=platform%2Fkernel%2Flinux-starfive.git

thunderbolt: Ignore port locked error in tb_port_wait_for_link_width()

Sometimes when polling for the port after target link width is changed
we get back port locked notification (because the link actually was
reset and then re-trained). Instead of bailing out we can ignore these
when polling for the width change as this is expected.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---

diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 525be2a..561e1d7 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -1168,10 +1168,17 @@ int tb_port_wait_for_link_width(struct tb_port *port, int width,
 
 	do {
 		ret = tb_port_get_link_width(port);
-		if (ret < 0)
-			return ret;
-		else if (ret == width)
+		if (ret < 0) {
+			/*
+			 * Sometimes we get port locked error when
+			 * polling the lanes so we can ignore it and
+			 * retry.
+			 */
+			if (ret != -EACCES)
+				return ret;
+		} else if (ret == width) {
 			return 0;
+		}
 
 		usleep_range(1000, 2000);
 	} while (ktime_before(ktime_get(), timeout));